Cartridge-type heater

Abstract

A cartridge-type heater (100, 200, 300, 400, 500) has a tubular metal sheath (110, 210, 310, 410, 510) and with an electrical heating element (222, 322, 422), which is arranged within the tubular metal sheath (110, 210, 310, 410, 510) and electrically insulated from the tubular metal sheath (110, 210, 310, 410, 510). The tubular metal sheath (110, 210, 310, 410, 510) has a first tubular part (120, 220, 320, 420, 520), in which the electrical heating element (222, 322, 422) is at least partially arranged. A tube opening (225, 325, 425) of the first tubular part is machined, especially by cutting, and has a second tubular part (130, 230, 330, 430, 530) connected to the first tubular part (120, 220, 320, 420, 520), which extends the tube interior space of the first tubular part (120, 220, 320, 420, 520) concentrically in the axial direction.

What is claimed is: 
     
         1 . A cartridge heater comprising:
 a tubular metal sheath;   an electrical heating element arranged within the tubular metal sheath and electrically insulated from the tubular metal sheath, wherein:   the tubular metal sheath has a first tubular part, in which the electrical heating element is at least partially arranged and has a second tubular part;   a tube opening of the first tubular part is machined by cutting; and   the second tubular part is connected to the first tubular part and extends the tube interior space of the first tubular part concentrically in an axial direction.   
     
     
         2 . A cartridge heater in accordance with  claim 1 , wherein the first tubular part and the second tubular part are aligned with one another. 
     
     
         3 . A cartridge heater in accordance with  claim 1 , wherein no projection in the radial direction inwards and/or outwards or a projection, which is smaller than the thickness of the tube sheath of the first tubular part, is present between the first tubular part and the second tubular part. 
     
     
         4 . A cartridge heater in accordance with  claim 1 , further comprising:
 an electrical connection arranged in the interior of the second tubular part between the electrical heating element; and   an electrical conductor of a supply line for supplying the electrical heating element with current.   
     
     
         5 . A cartridge heater in accordance with  claim 1 , wherein:
 the second tubular part has a machined tube opening;   the machined tube opening of the first tubular part and the machined tube opening of the second tubular part face one another and are machined complementary to one another.   
     
     
         6 . A cartridge heater in accordance with  claim 5 , wherein the machined tube opening of the first tubular part and the machined tube opening of the second tubular part are configured complementary to one another such that a connection between the first tubular part and the second tubular part is brought about in a correct position or in a correct location or both in a correct position and in a correct location. 
     
     
         7 . A cartridge heater in accordance with  claim 5 , wherein the machined tube opening of the first tubular part and the machined tube opening of the second tubular part are configured complementary to one another such that a transmission of forces, between the first tubular part and the second tubular part, is made possible or a transmission of torques, between the first tubular part and the second tubular part, is made possible or both a transmission of forces and a transmission of torques, between the first tubular part and the second tubular part, is made possible. 
     
     
         8 . A cartridge heater in accordance with  claim 5 , wherein:
 the complementarity of the tube opening of the first tubular part to the respective other tube opening is generated by machining by cutting; or   the complementarity of the tube opening of the second tubular part to the respective other tube opening is generated by machining by cutting; or   the complementarity of the tube opening of the first tubular part to the respective other tube opening is generated by machining by cutting and the complementarity of the tube opening of the second tubular part to the respective other tube opening is generated by machining by cutting.   
     
     
         9 . A cartridge heater in accordance with  claim 5 , wherein the tube openings, which are machined complementary to one another, form a defined tolerance pairing. 
     
     
         10 . A cartridge heater in accordance with  claim 5 , wherein:
 the first tubular part has a conically turned tube opening; and   the tube opening of the second tubular part facing the tube opening of the first tubular part has an inner cone configured complementary to the conically turned tube opening of the first tubular part.   
     
     
         11 . A cartridge heater in accordance with  claim 10 , wherein the cone ratio of the conically machined tube openings is selected such that a self-locking occurs. 
     
     
         12 . A cartridge heater in accordance with  claim 5 , wherein the tube openings, which are machined complementary to one another, are connected to one another or welded together with one another by a transition fit, a press fit or a force fit. 
     
     
         13 . A cartridge heater in accordance with  claim 1 , wherein a type of machining of the tube opening of the first tubular part provides a code as to a type of the cartridge heater.